Written through Rachael Link, MS, RD ~ above February 16, 2021 — medically reviewed through Jillian Kubala, MS, RD, Nutrition

Vitamin B12 shots and also supplements room popular amongst those looking for a fast fix for weight loss.

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In fact, part even case that raising your intake of vitamin B12 can aid fight fatigue, rise energy levels, and also speed up her metabolism.

However, research on the potential impacts of vitamin B12 on load loss has turned up blended results.

This article takes an in-depth look in ~ the evidence to identify whether vitamin B12 can help promote weight loss.

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Also sometimes referred to together cobalamin, vitamin B12 is a water-soluble vitamin that’s vital for several elements of health.

This vitamin is connected in developing DNA and also red blood cells, and also necessary for brain function, heart health, power production, and an ext (1).

It’s found naturally in many pet products and also sometimes included to fortified foodstuffs (1).

Vegans, vegetarians, older adults, and people through digestive concerns that deserve to interfere through nutrient absorption may be at a higher risk that vitamin B12 deficiency and need to supplement (2).

Supplements 101: Vitamin B12

Vitamin B12 is a water-soluble vitamin associated in several aspects of health, including DNA synthesis, red blood cabinet formation, and brain function.

Effects on body fat and also metabolism

Although study in people is still really limited, some studies indicate that vitamin B12 could affect body fat and metabolism.

One testimonial concluded the vitamin B12 theatre a an essential role in fat metabolism, noting the a deficiency can be connected to boosted fat buildup and obesity (3).

Another pet study discovered that severe vitamin B12 deficiency resulted in a far-ranging increase in body fat percentage and also cholesterol levels in pregnant mouse (4).

What’s more, one pet study showed that administering B vitamin to rats fed a high fat diet decreased weight gain and also increased levels of number of enzymes that affect metabolism, compared with a manage group (5).

However, present evidence is lacking, and added high high quality studies are needed to determine just how vitamin B12 may affect metabolism and body fat in humans.


Some animal studies suggest that a deficiency in vitamin B12 may boost body fat percentage and also alter metabolism. Much more research in human beings is needed.

Low levels might be connected to obesity

Interestingly, several studies have found that having adequate vitamin B12 levels may be associated with a reduced risk of weight gain and obesity.

According to one large study in 9,075 people, having higher blood levels of vitamin B12 was associated with a lower risk of excessive weight (6).

Similarly, one more study in 976 people showed that having low level of vitamin B12 was linked to a higher risk the overweight or excessive weight (7).

What’s more, a examine in 256 kids showed that youngsters with reduced levels the vitamin B12 tended to have actually a greater body mass index (BMI), i m sorry is a measure of body size determined by height and also weight (8).

However, store in mind the while this studies show an association in between vitamin B12 status and body weight, they don’t take other potentially contributing components into account.

Therefore, it can’t be concluded that vitamin B12 causes weight loss. An ext research is essential to recognize whether vitamin B12 straight affects body weight or BMI.


Some studies display that lower levels that vitamin B12 may be connected with a greater risk that overweight or obesity. Further studies are necessary to recognize whether other determinants may likewise be involved.

A vitamin B12 deficiency can lead come megaloblastic anemia, a condition identified by a low variety of red blood cells that are bigger than typical (9).

Megaloblastic anemia can cause a selection of symptoms and side effects, consisting of (10):

shortness of breathheadacheheart palpitationspoor balancememory loss

That said, being low in vitamin B12 doesn’t always lead to megaloblastic anemia, and many people may just experience mild symptoms like exhaustion (11).

Furthermore, if a deficiency in vitamin B12 might not reason weight gain, it deserve to decrease power levels and contribute to fatigue, making the harder to stay active and regulate your weight.

Conversely, some studies present that a deficiency in vitamin B12 may cause appetite loss, potentially causing weight lose if left untreated (12, 13).

If you’re short or deficient in B12, your healthcare provider will likely recommend oral vitamin B12 supplements or injections to increase your blood levels (10).


Low levels of vitamin B12 can cause megaloblastic anemia, i beg your pardon is identified by shortness the breath, headaches, and also fatigue. Enhancing your vitamin B12 intake deserve to protect versus deficiency to avoid these next effects.

Vitamin B12 is uncovered naturally in various food sources, including animal products choose meat, fish, poultry, eggs, milk, and milk products (1).

It’s also added to plenty of fortified foods, such as breakfast cereals and plant-based milk prefer almond, soy, or hemp milk (1).

Vitamin B12 supplements space also available in several forms, consisting of tablets, capsules, liquids, and lozenges.

It’s often discovered in plenty of multivitamin supplements as well.

Those that don’t regularly consume pet products wealthy in vitamin B12 may want come consider adding fortified foods to your diet or taking a complement to ensure the their nutritional needs are met.


Vitamin B12 is discovered in pet products and fortified foods. It’s also accessible in supplement type to help you accomplish your needs.

Vitamin B12 is vital water-soluble vitamin the plays a main role in several aspects of health, including brain function, love health, and the production of red blood cells and also DNA.

Studies present that having adequate blood level of vitamin B12 may be linked to a reduced risk of weight problems in children and adults. Plus, pet research suggests that vitamin B12 may impact body fat and metabolism.

Increasing her intake of vitamin B12 through foods items or supplements can aid prevent deficiency, i m sorry may improve side impacts like low energy levels and also fatigue.

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However, if you’re currently getting sufficient vitamin B12 in your diet and don’t have a nutrient deficiency, the unclear whether boosting your input of vitamin B12 will have actually much the an impact on load loss.